fix: hide faces (#3352)

* fix: hide faces

* remove unused variable

* fix: work even if one fails

* better style for hidden people

* add hide face in the menu dropdown

* add buttons to toggle visibility for all faces

* add server test

* close modal with escape key

* fix: explore page

* improve show & hide faces modal

* keep name on people card

* simplify layout

* sticky app bar in show-hide page

* fix format

---------

Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

mobile/openapi/test/people_update_item_test.dart

@@ -0,0 +1,46 @@
+//
+// AUTO-GENERATED FILE, DO NOT MODIFY!
+//
+// @dart=2.12
+
+// ignore_for_file: unused_element, unused_import
+// ignore_for_file: always_put_required_named_parameters_first
+// ignore_for_file: constant_identifier_names
+// ignore_for_file: lines_longer_than_80_chars
+
+import 'package:openapi/api.dart';
+import 'package:test/test.dart';
+
+// tests for PeopleUpdateItem
+void main() {
+  // final instance = PeopleUpdateItem();
+
+  group('test PeopleUpdateItem', () {
+    // Person id.
+    // String id
+    test('to test the property `id`', () async {
+      // TODO
+    });
+
+    // Person name.
+    // String name
+    test('to test the property `name`', () async {
+      // TODO
+    });
+
+    // Asset is used to get the feature face thumbnail.
+    // String featureFaceAssetId
+    test('to test the property `featureFaceAssetId`', () async {
+      // TODO
+    });
+
+    // Person visibility
+    // bool isHidden
+    test('to test the property `isHidden`', () async {
+      // TODO
+    });
+
+
+  });
+
+}